diff options
Diffstat (limited to 'samples/damon/prcl.c')
| -rw-r--r-- | samples/damon/prcl.c | 31 |
1 files changed, 22 insertions, 9 deletions
diff --git a/samples/damon/prcl.c b/samples/damon/prcl.c index 5597e6a08ab2..f971e61e6c5c 100644 --- a/samples/damon/prcl.c +++ b/samples/damon/prcl.c @@ -17,14 +17,14 @@ module_param(target_pid, int, 0600); static int damon_sample_prcl_enable_store( const char *val, const struct kernel_param *kp); -static const struct kernel_param_ops enable_param_ops = { +static const struct kernel_param_ops enabled_param_ops = { .set = damon_sample_prcl_enable_store, .get = param_get_bool, }; -static bool enable __read_mostly; -module_param_cb(enable, &enable_param_ops, &enable, 0600); -MODULE_PARM_DESC(enable, "Enable of disable DAMON_SAMPLE_WSSE"); +static bool enabled __read_mostly; +module_param_cb(enabled, &enabled_param_ops, &enabled, 0600); +MODULE_PARM_DESC(enabled, "Enable or disable DAMON_SAMPLE_PRCL"); static struct damon_ctx *ctx; static struct pid *target_pidp; @@ -109,23 +109,28 @@ static void damon_sample_prcl_stop(void) put_pid(target_pidp); } +static bool init_called; + static int damon_sample_prcl_enable_store( const char *val, const struct kernel_param *kp) { - bool enabled = enable; + bool is_enabled = enabled; int err; - err = kstrtobool(val, &enable); + err = kstrtobool(val, &enabled); if (err) return err; - if (enable == enabled) + if (enabled == is_enabled) + return 0; + + if (!init_called) return 0; - if (enable) { + if (enabled) { err = damon_sample_prcl_start(); if (err) - enable = false; + enabled = false; return err; } damon_sample_prcl_stop(); @@ -134,6 +139,14 @@ static int damon_sample_prcl_enable_store( static int __init damon_sample_prcl_init(void) { + int err = 0; + + init_called = true; + if (enabled) { + err = damon_sample_prcl_start(); + if (err) + enabled = false; + } return 0; } |